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Risk/Return:rr_RiskReturnAbstract 
Document Typedei_DocumentType485BPOS
Document Period End Datedei_DocumentPeriodEndDateAug. 31, 2011
Registrant Namedei_EntityRegistrantNameFIDELITY UNION STREET TRUST
Central Index Keydei_EntityCentralIndexKey0000035330
Amendment Flagdei_AmendmentFlagfalse
Document Creation Datedei_DocumentCreationDateOct. 27, 2011
Document Effective Datedei_DocumentEffectiveDateOct. 29, 2011
Prospectus Daterr_ProspectusDateOct. 29, 2011
Fidelity Arizona Municipal Income Fund
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeading
Fund Summary
Fund:
Fidelity® Arizona Municipal Income Fund
Objective [Heading]rr_ObjectiveHeadingInvestment Objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockThe fund seeks a high level of current income, exempt from federal income tax and Arizona personal income tax.
Fee Tablefust35330_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFee Table
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThe following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.
Shareholder feerr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Examplerr_ExpenseExampleAbstract 
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Portfolio Turnoverfust35330_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio Turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate10.00%
Strategy [Heading]rr_StrategyHeadingPrincipal Investment Strategies
Strategy Narrative [Text Block]rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Arizona personal income taxes.
  • Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
  • Allocating assets across different market sectors and maturities.
  • Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Risk [Heading]rr_RiskHeadingPrincipal Investment Risks
Risk Narrative [Text Block]rr_RiskNarrativeTextBlock
  • Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Geographic Concentration. Unfavorable political or economic conditions within Arizona can affect the credit quality of issuers located in that state.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Risk Nondiversified Status [Text]rr_RiskNondiversifiedStatusIn addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.
Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]rr_RiskLoseMoneyYou could lose money by investing in the fund.
Performancefust35330_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPerformance
Performance Narrative [Text Block]rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFuturePast performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.fidelity.com
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return6.69%September 30, 2009
Lowest Quarter Return-4.08%December 31, 2010
Year-to-Date Return7.54%September 30, 2011
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Performance Table Headingrr_PerformanceTableHeadingAverage Annual Returns
Performance Table Narrativerr_PerformanceTableNarrativeTextBlockAfter-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
For the periods ended
December 31, 2010
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table Explanation after Tax Higherrr_PerformanceTableExplanationAfterTaxHigherReturn After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Fidelity Arizona Municipal Income Fund | Class: Fidelity Arizona Municipal Income Fund
 
Shareholder feerr_ShareholderFeesAbstract 
Redemption fee on shares held less than 30 days (as a % of amount redeemed)rr_RedemptionFeeOverRedemption0.50%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Management feerr_ManagementFeesOverAssets0.55%
Distribution and/or Service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets none
Other expensesrr_OtherExpensesOverAssets none
Total annual fund operating expensesrr_ExpensesOverAssets0.55%
Expense Examplerr_ExpenseExampleAbstract 
1 yearrr_ExpenseExampleYear01 56
3 yearsrr_ExpenseExampleYear03176
5 yearsrr_ExpenseExampleYear05307
10 yearsrr_ExpenseExampleYear10689
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20014.84%
2002rr_AnnualReturn20029.93%
2003rr_AnnualReturn20035.22%
2004rr_AnnualReturn20043.73%
2005rr_AnnualReturn20052.70%
2006rr_AnnualReturn20064.43%
2007rr_AnnualReturn20072.57%
2008rr_AnnualReturn2008(4.21%)
2009rr_AnnualReturn200913.65%
2010rr_AnnualReturn20102.33%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelHighest Quarter Return
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn6.69%
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelLowest Quarter Return
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(4.08%)
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2010
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-Date Return
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn7.54%
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateSep. 30, 2011
Fidelity Arizona Municipal Income Fund | Return Before Taxes | Class: Fidelity Arizona Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Arizona Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn Before Taxes
Past 1 yearrr_AverageAnnualReturnYear012.33%
Past 5 yearsrr_AverageAnnualReturnYear053.59%
Past 10 yearsrr_AverageAnnualReturnYear104.42%
Fidelity Arizona Municipal Income Fund | Return After Taxes on Distributions | Class: Fidelity Arizona Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Arizona Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn After Taxes on Distributions
Past 1 yearrr_AverageAnnualReturnYear012.33%
Past 5 yearsrr_AverageAnnualReturnYear053.56%
Past 10 yearsrr_AverageAnnualReturnYear104.35%
Fidelity Arizona Municipal Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class: Fidelity Arizona Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Arizona Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn After Taxes on Distributions and Sale of Fund Shares
Past 1 yearrr_AverageAnnualReturnYear012.83%
Past 5 yearsrr_AverageAnnualReturnYear053.62%
Past 10 yearsrr_AverageAnnualReturnYear104.34%
Fidelity Arizona Municipal Income Fund | Barclays Capital® Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital® Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses, or taxes)
Past 1 yearrr_AverageAnnualReturnYear012.38%
Past 5 yearsrr_AverageAnnualReturnYear054.09%
Past 10 yearsrr_AverageAnnualReturnYear104.83%
Fidelity Arizona Municipal Income Fund | Barclays Capital Arizona 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital Arizona 4+ Year Enhanced Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses, or taxes)
Past 1 yearrr_AverageAnnualReturnYear012.61%
Past 5 yearsrr_AverageAnnualReturnYear054.44%
Past 10 yearsrr_AverageAnnualReturnYear105.05%
Fidelity Maryland Municipal Income Fund
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeading
Fund Summary
Fund:
Fidelity® Maryland Municipal Income Fund
Objective [Heading]rr_ObjectiveHeadingInvestment Objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockThe fund seeks a high level of current income exempt from federal income tax and Maryland personal income taxes.
Fee Tablefust35330_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFee Table
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThe following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.
Shareholder feerr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Examplerr_ExpenseExampleAbstract 
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Portfolio Turnoverfust35330_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio Turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate22.00%
Strategy [Heading]rr_StrategyHeadingPrincipal Investment Strategies
Strategy Narrative [Text Block]rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Maryland personal income taxes.
  • Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
  • Allocating assets across different market sectors and maturities.
  • Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Risk [Heading]rr_RiskHeadingPrincipal Investment Risks
Risk Narrative [Text Block]rr_RiskNarrativeTextBlock
  • Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Geographic Concentration. Unfavorable political or economic conditions within Maryland can affect the credit quality of issuers located in that state.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Risk Nondiversified Status [Text]rr_RiskNondiversifiedStatusIn addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.
Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]rr_RiskLoseMoneyYou could lose money by investing in the fund.
Performancefust35330_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPerformance
Performance Narrative [Text Block]rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFuturePast performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.fidelity.com
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return5.96%September 30, 2009
Lowest Quarter Return-3.37%December 31, 2010
Year-to-Date Return6.82%September 30, 2011
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Performance Table Headingrr_PerformanceTableHeadingAverage Annual Returns
Performance Table Narrativerr_PerformanceTableNarrativeTextBlockAfter-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
For the periods ended
December 31, 2010
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table Explanation after Tax Higherrr_PerformanceTableExplanationAfterTaxHigherReturn After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Fidelity Maryland Municipal Income Fund | Class: Fidelity Maryland Municipal Income Fund
 
Shareholder feerr_ShareholderFeesAbstract 
Redemption fee on shares held less than 30 days (as a % of amount redeemed)rr_RedemptionFeeOverRedemption0.50%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Management feerr_ManagementFeesOverAssets0.55%
Distribution and/or Service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets none
Other expensesrr_OtherExpensesOverAssets none
Total annual fund operating expensesrr_ExpensesOverAssets0.55%
Expense Examplerr_ExpenseExampleAbstract 
1 yearrr_ExpenseExampleYear0156
3 yearsrr_ExpenseExampleYear03176
5 yearsrr_ExpenseExampleYear05307
10 yearsrr_ExpenseExampleYear10 689
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20014.74%
2002rr_AnnualReturn20028.64%
2003rr_AnnualReturn20035.02%
2004rr_AnnualReturn20044.06%
2005rr_AnnualReturn20052.55%
2006rr_AnnualReturn20064.14%
2007rr_AnnualReturn20073.04%
2008rr_AnnualReturn2008(3.98%)
2009rr_AnnualReturn200913.78%
2010rr_AnnualReturn20102.27%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelHighest Quarter Return
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn5.96%
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelLowest Quarter Return
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(3.37%)
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2010
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-Date Return
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn6.82%
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateSep. 30, 2011
Fidelity Maryland Municipal Income Fund | Return Before Taxes | Class: Fidelity Maryland Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Maryland Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn Before Taxes
Past 1 yearrr_AverageAnnualReturnYear012.27%
Past 5 yearsrr_AverageAnnualReturnYear053.69%
Past 10 yearsrr_AverageAnnualReturnYear104.34%
Fidelity Maryland Municipal Income Fund | Return After Taxes on Distributions | Class: Fidelity Maryland Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Maryland Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn After Taxes on Distributions
Past 1 yearrr_AverageAnnualReturnYear012.27%
Past 5 yearsrr_AverageAnnualReturnYear053.68%
Past 10 yearsrr_AverageAnnualReturnYear104.31%
Fidelity Maryland Municipal Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class: Fidelity Maryland Municipal Income Fund
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameFidelity Maryland Municipal Income Fund
Labelrr_AverageAnnualReturnLabelReturn After Taxes on Distributions and Sale of Fund Shares
Past 1 yearrr_AverageAnnualReturnYear012.68%
Past 5 yearsrr_AverageAnnualReturnYear053.70%
Past 10 yearsrr_AverageAnnualReturnYear104.28%
Fidelity Maryland Municipal Income Fund | Barclays Capital® Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital® Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses, or taxes)
Past 1 yearrr_AverageAnnualReturnYear012.38%
Past 5 yearsrr_AverageAnnualReturnYear054.09%
Past 10 yearsrr_AverageAnnualReturnYear104.83%
Fidelity Maryland Municipal Income Fund | Barclays Capital Maryland 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital Maryland 4+ Year Enhanced Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses, or taxes)
Past 1 yearrr_AverageAnnualReturnYear012.89%
Past 5 yearsrr_AverageAnnualReturnYear054.60%
Past 10 yearsrr_AverageAnnualReturnYear105.12%